Stone-dressing machine



(Nomaden.) '5 sheets-sheet 1.

0.T..DUTR0.` STONE DRESSING MAGHINE` N0. 570,466. Patented Nov. 3, 1896.

(No Model.) 5 Sheets- Sheet `2.

0. T. DUTRO. STONE DRESSING MACHINE.

Patented Nov. s, 1896.

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(No Model.) i

0.` T. DUTRO. STONE-DRESSING MAGHINE.

Patented Nov. 3, 1896.

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(No Model.) 5 Sheets-Sheet 4. 0'. 'I'. DUTRO. r STONE DRESSING MACHINE.

Patented Nov. 3, 1896.

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STONE DRESSING MACHINE. No.' 570,466. Patented Nov. 3, .1896.

UNITED STATES PATENT rricn.

OLIVER T. DUTRO, OF BUFFALO, NEW YORK.

STONE-DRESSING MACHINE.

. SPECIFICATION forming part of Letters Patent N o. 570,466, dated November 3, 1896.

Application ned December 31.1894. serai No. 533.418. uit moda To alt whom t may concern:

Be it known that I, OLIVER T. DUTRo, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented a new and useful Improvement in Stone-Dressing Machines, of

which the following is a specification.

This invention relates to a stone-dressing machine designed more especially for dressing comparatively small blocks, such as paving-stones, although the same is equally useful for dressing larger work, such as building-stones.

My invention has more especial reference to a machine of this class in which the stones are clamped in a fixed holder and in which the cutting-tool is mounted Von a carriage which traverses the stone-holder.

One of the objects of my invention is to improve the constructionof the stone-holding devices, so as to reliably clamp the stone and facilitate the operation of changing its position for present-ing its various sides rto the cutting-tool.

The invention has the further objects to improve the construction of the cutting-tool, to render the tool-carriage readilyadj ustable for centering the tool relatively to the stone, to render the carriage vertically movable by simple means, so that it can be raised on its return stroke, and also to-improve the construc-tion of the actuating devices which cooperate with the cutting-tool.

In the accompanying drawings, consisting of live sheets, Figure l is a side elevation of that side of the machine on which the operator stands. Fig. 2 is an elevation of the opposite side of the machine. Fig. is a top plan view of the machine, partly in section. Fig. 4 is a longitudinal sectional elevation of the same. Fig. 5 is a transverse section of the machine in line 5 5, Fig. 2. Fig. 6 is a similar section in line G G, Fig2, with thel pneumatic cylinder omitted.

. Like letters of reference refer to like parts in the several figures. i

The stationary frame of the machine comprises a suitable base A, a bed or horizontal plate AQ resting upon the base, upright longitudinal side plates A2, extending upward from the bed-plate, and end plates A3, con nectin g the side plates, the side and end plates vbeing preferably formed integrally with the bed-plate. f Y

B is an upright abutment or longitudinal Wall, which is arranged between the side plates A2 near the rear end of the machine and against which the stone to be dressed is clamped.

C is a vertically-adjustable table or plat form arranged adjacent to the wall B and forming a bottom rest or support for the stone. This table is preferably pro vided with an inclined supplemental platform O, which slopes toward the wall B, and thus causes the stone to hug the wall. This supplemental table is removably confined upon the main horizontal table byvertical pins c, fitting into openings formed in the main table, as shown in Figs. 4 and 5, so that, ifV desired, the supplemental table may be removed and the stone supported upon t-he main table.

l) represents a transverse wedge whereby the `vertically movable table is adjusted. This wedge preferably consists of a pair of parallel plates, which are connected by transverse plates or webs d and which are guided on transverse rails or ways CZ', formed on the bed-plate, the latter being extended beyond the sides of the base at this point to afford the necessary range of movement of the wedge, the wall B and the side plates being provided with slots or openings for the passage of the wedge.

The table O is formed with depending flanges c', having inclined lower edges which rest upon the inclined members of the ad' justing-wedge, the edges of such flanges being rabbeted, as shown in Fig. 4, to hold the table against lateral displacement on the wedge.

E is a transverse adj Listing-screw whereby the wedge is operated; This screw engages with a screw-nut or threaded opening e, formed in the end wall of the wedge, and is free to turn in bearings formed in the wall B and an upright lug e' of the bed, but is held against lengthwise movement by a collar e2, secured to its inner end andbearing against the wall I3, and a hand-wheel E', secured to its outer end and bearing4 with its collar against the lug` e'. Upon turning the adjusting-screw in one or the other direction by its handwvheel the wedge is shifted forwarder IOC) backward accordingly, thereby raisin g or lowering the table and the stone and causing the Stone to project more or less above the upper edge of the wall B. The table rests loosely upon the wedge and remains in place against the wall B by gravity.

F F represent laterally-movable clamps arranged opposite the wall or abutment B and adapted to impinge against the adjacent side of the stone. In the construction shown in the drawings the clamps are provided with Hat-sided or rectangular shanks, which are guided in correspondingly-shaped openings formed in the adjacent sid-e plate A2, so. as to be held against turning, and each of such shanks is formed at its outer end with a screw-nut f, with which engages a rotary clamping-screwF. This screw turnsin bearings formed in the adjacent side plate and in a lug f', secu-red to a bracket f2, but is held against longitudinal movement by a shoulder f3, formed at its inner portion and bearing against the adjacent side plate, and a collar f4, secured to its outer portion and bearing against the lug f', sol that the clamping-jaw is moved toward or from the stone by turning` its actuating-screw in the proper direction, each. screwbeing provided with a handwheel, as show n, for operating it.

G, represents an adj ustable rear abutment or clamp which bears against the rear side of theI stone and prevents its displacement in that direction. This clamp consists of a block having a receding bearing-face arranged substantially at right angles to the wall B, and an oblique rear side which bears against an oblique guide or bar or wall H, arranged: in rear of the side clamps and preferably formed integrally with the side plates of the machine. The clamping-block is provided on. its rear side withl a longitudinal rib g, which is fitted in a corresponding slot formed in the oblique guide-bar, as shownl in Fig. 4t..

g. is av lug or screw-nut formed on a bar g2, which bearsagainst the rear side of the guidebar and which is secured to the rib of the clamping-block.

l is'an oblique rotary clamping-screw which is held against longitudinal movement in its bearing-t',l by collars i' and which engages with the screw-nut g. of the rear clamping-block. Upon, turning thisoblique screw forward by means of its hand-wheel t2 the clamping-block is shifted forward on its guide-bar, causing itstransverse front face toapproach the stone and bear against the rear side thereof, thus effectually resisting displacement of the stone in a rearward direction.

As shown in the drawings, the oblique bar or wall Il is arranged at anacute angle to the abutment B, andthe end thereofnearest the side clamps is located: opposite the rear por tionof saidabutment. By this arrangement the oblique bar serves to retain the stone in an upright position, preparatory to clamping it,`by pushing t-he same against the oblique bar, as shown in Fig. 3, the stone being thus prevented from tipping away from the Wall B while the operator or his assistant manipulates the several clamping-screws. The oblique arrangement of the clamping-screw of the rear block also brings the handy/heel of said screw in close proximity to those of the side clamp-screws, enabling the operator or assistant to manipulate the various handwheels from a practically single point and facilitating the operations of clamping and releasing the stones.

J is the cutting-tool, and K is the carriage upon which the tool and its actuating devices are mounted and whereby the tool is moved up to and past the clamped stone for dressing it. This carriage ymoves upon longitudinal ways or tracks. formed by the upper edges of the sildeplates A2 and consists, essentially, of longitudinal sidev pieces 7c, which are formed with upwardly-.extending plates 7d and a transverse rod 762-, which connects these plates. The cutting-tool preferably consists of a horizontal steel plateprovided in its front edge with an angular or V-shaped notch, the edges of which are sharpened and beveled to form the cutter. at one of its longitudinal edges in a groove Z, formed in the lower inner side of one of the side members of the carriage and at its opposite edge in a groove formed partly by a rabbet F,v arranged inthe other side member of the carriage, and partly by a cap-plate Kremovably secu-red te the under side of the lastnamedv carriage member and engaging ina rabbet formed in the adjacent edge of the cutting-tool, asv shown in Fig. 6.

Z3 represents cushions, of rawhide, vulcanized ber, or similar materiaLWhichfare intel'- posed between the front ends of the toolgrooves and the adjacent portions of the tool and which receive the impact of the latter.

M is the actuating-cylinder of the cuttingtool, which is mountedI upon the carriage in rear of the tool. m is the usual reciprocating piston-rod or hammer, and m an impactblock which is interposed between the front end of said rod and the rear end of the cut-- ting-tooll and whereby thel blows, which are delivered in rapidsuccession upon the block, are transmitted to the cutting-tool. This impact-block extends across the entire width of the cutting-tool, by which construction the blow transmitted. by the block to the tool is equalizedl across the width of the latter, thereby avoid-ing the uneven strain upon the toolk and the consequent springing of the same, which would be liabley to occur if the comparatively small piston -rod were arranged. to strike directly against the rear end of the tool.

The actuating-cylinder may be supplied with compressedair or steam. It is preferably supported in an inclined position by means of bands or rings N, which embrace the cylinder and which are provided on opposite sides with studs or trunnions n.. The,

The c-uttingtool is coniined.

IOO

IIO

studs of the rear supporting-ring rest loosely in elongated notches or recesses n', formed in the upper edge of the side plates of the carriage, while the studs of the front supporting-ring are arranged in Vertical notches n2, also formed in said side plates in front of the elongated notches, and having forwardlyextending horizontal branches n3. This construction permits the actuating-cylinder to be readily put in place on the carriage or removed therefrom, and the elongated rear notches and the horizontal branches of the 'front notches permit the cylinder to be adj usted forward on the carriage to compensate for the wear of the cutting-tool.

The actuating-cylinder is held from turning in its supporting-rings by set-screws n4.

It is well known that the lower side of the bore of a horizontal or reclining1 actuatingcylinder receives greater wear from the piston than its upper side. By supporting the cylinder in the manner herein shown and described it may be reversed iny itsfsupportf ing-rings from time totimeby loosen'ingthe set-screws n4, so as to equalizethewear.

The intermediate impact-block mf is supported at its upperend by studs m2, project-` ing laterally therefrom and seated loosely in horizontal slots m3, which are formed in the upright side plates of the carriage and which permit the impact-block to shift forward with the cylinder to compensate for the wear of the cutting-tool. Each of these slots is provided with a curved branch m4, which eX'- tends upwardly and rearwardly from its rear end and which terminates in a horizontal portion m5. In removing the tool from the carriage the studs of the impact-block are passed into the curved branches of the slots m3 and the block is hung by meansof its studs inthe horizontal extremity of said slots, as shown by dotted lines in Fig. 4.' In this position it is out 'of the way and permits the cutting-tool to be conveniently withdrawn from'its grooves and replaced in the carriage, the' block being again returned to its operative position after inserting the tool.

In order to obtain the best results, it is desirable that the apex of the V-'shaped cu'tting-tool should coincide with the center of the stone. The blocks of stone vary in size, and in order to enable the tool to be readily centered the tool-carriage is made laterally adjustable on its guideways. In the construction shown in the drawings this adjustment is effected by a pair of horizontal screws o, which engage in screw-threaded openings formed in a depending flange 0, arranged on one of .the side pieces of the Vcarriage and which bear at their inner ends against the adjacent side plate of the machine, as shown in Fig. G. Upon turning these adjustingscrews forwardly by means of` their handwheels the tool-carriage is drawn toward 4the side of themachine on which theadjustingscrews are located, the carriage being adjusted in the opposite direction by turning riage,and are adapted to bear against the car-` the screws backwardly and pushing the carriage laterally on its ways.

The lateral movement of the carriage is limited in one direction by the adjustingscrews o and in the other by a flange o2, depending from the opposite side piece of the carriage, as shown in Figs. 2 and 6, the depending iianges of the two side'pieoes being arranged at a sufficient distance apart to afford the necessary lateral adjustment of the carriage.

In the drawings only one stone-clamping device or holder is shown, but in practice a row or series of such holders is preferably employed, a stone being clamped in each holder and the cutting-tool and carriage being moved past the entire series before returning it to its initial position. When the machine is thus organized, the operator, who contrcls the tool-carriage, stands on that side of the machine, on which the adj usting-screws of the carriage are located, and av helper or'assistant, who clamps the stones and changes their position in the holders, stands on the opposite side of the machine.

In the operation ofthe Vmachine the assistantiirst clamps the stones in the'series of holders, this being done by placing each stone upon its table C and adjusting the same to project the stone above the wall to theV de-` sired extent, then tightening the side clamps F, and finally` tightening the reark block or clamp Gr against the rear side of the stone. The operator now advances the' carriagefso as to bring the cutting-tool against the rst stone, whereby the projecting portion of the latter is dressed oft by the rapid blows delivered against the cutting-tool. After dressing the first stone the operator moves the carriage onward to and past the second stone, and so on throughout the entire series. As soon as a stone has been thus dressedion one side or edge the assistant changes its posi-,.

tion, so as to present another edgeA thereof to the'cutting-tool upon the next forward movement of the carriage, thus rendering the work practically continuous.

In order to permit the cutting-tool to clear the projecting portions of the stones which IOO have been thus changed by the assistant, the

carriage is made vertically movable, so that it may be raised by the operator on its return movement. i

The carriage-lifting mechanism shown in the` drawings consists of four rotary cams' or eccentrics p, two of which are arranged near the front end of the carriage, on opposite sides thereof, and the other two near the rear end of the same. The front eccentric-s are secured to the projecting end portions of a transverse shaft p, j ournaled in the front portions of the side members of the carriage, and the rear eccentrics are secured to a similar shaft journaled in the rear portions of said members. These eccentrics project through open-l ings piformed'in the side members ofthe carriage-ways, so that upon turning the shafts in the proper direction toy bring the large l'adius of the eccentrcs below the shafts thecarriage is lifted from its ways clear of the projecting stones, permitting it to be returned to its initial position without striking the stones.

Each of the eccentric-shafts is provided with a hand-lever p3 for turning it. In moving the carriage back to the starting-point the operator seizes these hand-levers, the carriage sliding upon its ways by means of the eccentrics. After returning the carriage the/hand'- levers are turned in the proper direction to allow the carriage to descend to its normal position, and the carriage is again moved successively past the newly-placed stones, these operations being repeated until the stones have been dressed on all sides, when a new lot of stones is placed in the holders.

In my improved machine the movement of the tool-carriage is at all times under the control of the operator, who can thus advance the carriage with greater or less speed and with more or less pressure, as the nature of the stones may require, thereby facilitating the'dressing opera-tion and avoiding injury to-the cutting-tool.

By employing a cutting-tool' of the form shown the converging cutti-ng edgestend to compress the particles of the stone, rendering the same less liable to chip or splinter at the corners.

The rear clamping-block of the stone-holder can be adj-usted to extend entirely across the rear end of the stone, and thelatter is ther-ee fore firmly clamped and protected and' prevented from splintering at its rear corners.

The bed-plate is provided aro und the stone supporting table C with apertures q, through which the chips drop upon the floor.

I claim as my inventionl. In a stone-dressing machine, the combination with the stationary frame having guideways, of a stone clamp or holder, a carriage moving on said ways, a cutter or chisel mounted on said carriage and having a V-shaped notch forming convergingcutting edges, an actuating-cylinder also` mounted on said carriage and a piston arranged in said cylinder and having. a rod or hammer arranged to operate against said chisel substantially as set forth.

2. The combination with the stationary frame and the tool-carriage, of an upright wall or abutment against which the stones bear, a wedge movable toward and from said abutment and having its incline trendingtoward` the same, and a vertically-movable table having an inclined under side resting looselyon said wedge and bearing at its front edge against said abutment whereby the table is prevented from moving away from the wedge and compelled to rise when the wedge is advanced, substantially as set forth.

- 3. The combination with the stationary frame of the machine and the tool-carriage, of an upright longitudinal wall or abutment for the stones, a stone-clamp arranged oppo* site said abutment, a transverse supportingwedge movable toward and from said abutment and having its incline trending toward the same, a vertically-movable table having an inclined under side resting loosely on the wedge and bearing at its front edge against said abutment, whereby the table is prevented from moving away from the wedge and an adjusting-screw engaging with said wedge, substantially as set forth.

4. The combination with the stationary frame of the machine, of a wall or abutment against which the stone to be dressed bears and an oblique bar or wall supported on the frame of the machine and arranged at one end of said abutment and at an acute angle thereto, whereby the stone resting against said abutment is prevented' from tipping away therefrom by the oblique bar or wall, substantially as set forth.

5. The combination with the stationary frameot the machine, having an abutment for the stone, of an: oblique bar arranged in rear of said abutment, and an adjustable clamping-block having an oblique rear face bearing against said oblique bar and a transverse front face adapted to impinge against the rear side of the stone, substantially as sety forth.

6. rlhe combination with the stationary fra-me of the machine having an abutment forthestone, of an oblique bar arranged in rear of said abutment,` an adjustable clamping-block having an oblique rear face bearing against said oblique bar and a transverse front face adapted to impinge against the rear side of the stone, and an oblique adjusting-screw engaging with saidA clamping-block, substantially as set forth.

7?. The combination with the stationary frame and an upright wall or abutment against which the stone is adapted to bear, of a vertically-adjustable table arranged adjacent to said wall and supporting the stone, a` clamp arranged opposite said wall and adapted toz i'mpingev against the side of` the stone, an oblique bar arranged in rear of said. walh and anadjustable clamping-block guidedl on said oblique bar and adapted to impinge` against the rear side of the stone, substantially as set forth.

8. The combination with the stationary frame, the tool-carriage and upright abutment for the stones,l of a main supportingtable arranged adjacent to said abutment, and a supplemental table or platformremovably arranged on the main table and sloping toward said abutment, whereby the stones are caused tohug the abutment, substantially as set forth.

9. The combination with the stationary frame of the machine having` guideways, of a stone clamp. or holder, and a tool-carriage IOO IIO

supported on said guideways and having` cams or eccentrics for elevating it, substantially as set forth.

lO. The combination with the stationary frame of the machine having guideways, of a stone clamp or holder, a toolcarriage supported on said guideways, transverse rotary shafts journaled in the front and rear portions of said carriage, and eccentrics secured to said shafts and adapted to bear against said guideways for elevating the carriage, substantially as set forth.

1l. In a stone-dressing machine, the combination with the main frame, a stone-holder and a tool-carriage arranged to traverse the stone-holder, of a supporting-ring mounted on said carriage, an actuating-cylinder reversibly supported in said ring and a clamping dev Vice for securing the cylinder in place in said ring, substantially as set forth.

l2. The combination With the main frame and the carriage, of a cutter-plate or chisel mounted therein, an actuating-cylinder and piston supported on said carriage, and an impact-block interposed between the rear end of the cutter-plate and the rod of said piston and extending` across the Width of the cutterl plate, whereby the strain upon said plate is equaIiZed, substantially as set forth.

on said carriage, and an impact-block having, Supportingstuds arranged in the slots of said side plates, substantially as set forth.

Vitness my hand this 26th day of December, 1394..

OUVER T. DUTRO. Witnesses:

CARL F. GEYER, KATHRYN ELMORE. 

